My Wynstn who is 2 1/2 years old, humps, usually when he knows that we are leaving. And yes it is his blankets. He will drag them to his favorite spot and go to it after bunching them up. My 14 year old yorkie, never humped, so go figure
Wynstn has not been fixed and the older one has. When we take corky the older one to get his hair done, Wynstn won't leave him alone for about 3 days we don't understand why only at this time, its almost as if Wynstn thinks it is a new dog.